Signaling system.



0; M. LEIGH. SIGNALING SYS TEM. APPLICATION FILED 1 33.15.1909.

938,155. Patented 001;. 26,119@@ 2 SHEETS-SHEET 2 G am/731m waf @W 1 assyisa.

' original a'ppllcatlon'flled December 10,

" T 0 all who in it may concern:

ILLINOIS, ASSIQN OB T0 CBACRAFT-LEICH ELECTRIC GOM- rnnmors, A

OSCAR 1a. amen, or canon,

conronarron or rumors.

".PANY, or GENOA,

' SIGNA ING SYSTEM.

Specification of Letters l atent. 'Patented 001;. 26, 1909.

1908,'S'erial- No. 456,777. Divided and this application filed February 15, 1909. Serial No. 478,082.

. vals to establish the telephonic continuity of the circuit metallically, and I have called the line wires 1 and 2 he same throughout that I,

OSCAR M LEIGH, United States, residm Be it known citizen of the Genoa, in the county of Dekalb and ttate the variousstations. so of Illinois, have invented a certain new an I connect telephone circuits metallically useful Improvement in'Signaling Systems, from the terminals. l. and 5, which tele- "of which the, following is a full, clear, conphones are shown more in detail in Fig. 2, else, and exact description, reference being and which telephones consist of'the receiver had to the accompanying drawings, form- 6, transmitter 7, switch-hook 8, and induc 1:1 part of this specification. I tion coil 9. These telephone circuits are .l. y invention relates to sigpnaling systems, adapted for communication with the doand is more particnlarly-al ied to railway spatchers telephone set consisting of the signalingxsystemsr This invention is a di head receiver 6, induction coil 9, andtransvisional application of any former applicamitter 7, all metallically over he circuit, as tion, Serial'No. 466,777, filed Dec. 10, 1908. shown, there being shown in Fig. 1, besides Generally speaking,my invention comthe train dcspatchers telephoncyset, eight rises a:' metallic telephone circuit, over metallic telephonestations. which telephone conversations can be car- It'is necessary to call the various stations ried-on metallically, and in addition, the ar selectively, and' for this purpose, the train rangementron. said metallic circuit of a pluclespatcher is provided with a key 10 and rality of-non-interfering telephone circuits, battery 11, so that he can transmit metallic all incombination with selective signaling im ulsesover the line. These metall c immeans for calling the telephone instruments pu ses actuate. a relay 12, which relay, when associated with. the aforesaid metallic, telereceiving impulses, operates the relay- 13, phone circuit, and selective signaling means thereby to actuate the pivoted pawl '14-, for sub-station tandem telephones arran ed which rotates the wheel 15. The wheel 15 on the "localtandem circuits. In 0t 181 is provided with a contact arm '16, and with words,- it is a complete system of through openings which permit the ctmtaet arm 1G to ;telep h.one service. andllocalfor block telebe in contact with a dill'ercnt opening for tail by reference I Figure '1 sets forth diagrammatically thev sets forth more in eachstation on the line. The first impulse ofthe relay ll also operates the relay 17, which thereby releases the clock mechanism 18, and permits it to travel i contra-clockwise direction. The clock mechanism l8 is hone service 'in combination with selective to effect selective calls'between the various stations and circuits.

3 I'will describe my invention more-in dcto the accompanying drawthe preferred embodiment,

\ provided with a contact member 19. It is designed that the clock niec'hanism 18 shall i move morejslowly than the wheel 15 is moved forwardly by the impulses. \Vhcn the wheel 15 is stepped up to its proper contact-making position, as shown in Fig. 2, My general system, asshown in Fig. 1, the wheel 15 is finally va-mm by the clock comprises a wcentral-station.A, and sub-stal mechanism 18, and circui'tismlosed through v E, F, G and'll. Line Wires 1 therelay 20, which lhcrlah'yoperates the local although in 1 signal 21., and at the same time,

the preferred form, wh'ch I herein indicate, through the aux liary winding 22, repeating coils 3, 3 arekntcrposcd at interl itself ings illustrating in which general circuit arrangements, and F1g. 2 dctall thc selector equipment' for calling the metallic stations.

and 2 unite the various stations locks the relay 20/91 in position until relcasedby the open H After making contact, the clock mechanism 18 continues to revolve until its contact memher engages the segment 24, whereupon cir- Quit is closed through the relay 25, which releases the wheel 1.5, and allows it, by virtue of the we ght 26, to reach its normal posi-, tion, whereupon circuit is opened through the springs 27 and QS-by the insulating stri 29, which again opens the circuit througi the relay 25, and allows all parts to be restored t normal ready for another call. It will thusbe seen that the central station 0perator cau. call selectively either one of the stations from A to H, and can converse with them metallically.

In order to provide further necessary commuuimitional advantages over the circuit, 1 insert repeating coils 3, as before stated, which subdivide the circuit 12 into a Inrality of tandem telephone c rcuits, WllCh are connected at the contacts 30 and 31,-- that is, they are taken off from the central ortions of the repeating coils 3, and rom the central portion oi the windings of impedance coilsv 32. Thus, a plurality of ground ,telephone circuits are, established. For instance, the ground circuits between Stations A, B, and the loft'handside of stai n C, can communicate with each other; likewise, stations E, F and G; but the repeating coils prevent intercommunicatio'n over these ground circuits from one tandem circuit to the other. These grounded telephone circuits at the stations C, E and G, for instance, are provided with iteys 33, which permit a station telephone set at said stations to be connected to either the right-- hand or left hand tandem, vthus obviating the necessity of two telephone sets at these.

stations. The telephone sets at said stations comprise the transmitter 34, receiver 35, induction coil 36, and switch-hook 37; the instruincntalities above mentioned b ing shown only in connection with the station A, but their connections at the other stations at the-terminals 30 and 31 will be obvious, These sub-station bloclptclephones are also provided with a reverse key 38, which Pop:

mits the reversal of the pulsating current generator upon their circuits, thus making it ossible to send either positive or negative pulsating current over the tandem clrcult.

0r instance, station Q, with positiv b t.

tery current, can call station D, and with negative battery current can call station E, or the reverse, so that the three stations C, I) and E can signal between themselves selectively. I find it of great advantage not to provide a great number of repeating coils in the circuit, andior this reason I, provide the impedance coils 32, which impedance coils permit'of telephones being associated on the tandem circult or block circuit.

7 From the'foregoing, it will be seen that I.

pliances for each of said additional-circuits,

can signal selectively over the metallic circuit, and also selectively over the block I circuit.

While I have herein shown and particu' larlydescribed the preferred embodiment of my invention, I do not limit myself to they precise construction and arrangement herein set forth, but

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A telephone system comprising a metallic circuit, repeating coils 'for maintaining the telephonic continuity of said. metallic circuit, t lephonic appliances at a central station nds plurality of sub-stations arranged for the transmission of voice currents metallically over said circuit, means at the central station for selectivelycallin either substation, a plurality of additiomil non-interferin telephone circuits, arran ed d to end an circuit and a return circuit, telephonic apand reactive means for preventing telephonic interference between conversations simultaneously carried on over all of the telephonic circuits aforesaid.

2. A telephone system comfprising a metal lic circuit, repeating coils v or maintaining the telephonic continuity of said metallic circuit, telephonic appliances at a central station and a plurality of sub-stations arsuperposed on said meta llic ranged for the transmission of voice cur- 'rents metallieally over said circuit, means at the central station for, selectively callin either sub-station, a

plurality of additions. non-interferin telep ione'eircuits arr'ari ed end to end and superposed, on said metallic circuit and a eturn circuit, a lurality' of telephonicappliances, for each e t said;addi'-.

a pliances q ll themselves ti na-l cir uits, signaling devices wliereb);

or the telephonic circuits aforesaid.

lic circuit, repeatlng coils the telephonic continuity of said metallic circuit, telephonic appliances at a central' station and a plurality of sub-stations 1mranged for the transmission of voice currents metallically over said circuit, means at the central station for selectively callin either sub-station,'a' lurality of additiona non-interfering telep one circuits, arran ed end to end and superposed onsaid'meta lic circuit and a return circuit, and reactive means for preventing telephonic interference between conversations simultaneouslyv carried on over all of the telephonic circuits aforesaid. 4. A'telephone system comprising a metal;-

' conversations simultaneously carried on over all of the telephonic circuits aforesaid.

1n Witness whereof, I hereunto subscribe my name this 8th day of February, A. D. 1909.

. OSCAR M. LEICH.

'Witnesses MAX W. ZABEL, JEAN ELLIOTT. 

